U.S. patent application number 10/514242 was filed with the patent office on 2005-09-22 for method for coating a surface of a track component, in addition to a track component.
This patent application is currently assigned to BWG GmbH & Co. KG. Invention is credited to Heilscher, Joachim, Kunitz, Walter, Schmedders, Stefan.
Application Number | 20050208310 10/514242 |
Document ID | / |
Family ID | 30001484 |
Filed Date | 2005-09-22 |
United States Patent
Application |
20050208310 |
Kind Code |
A1 |
Kunitz, Walter ; et
al. |
September 22, 2005 |
Method for coating a surface of a track component, in addition to a
track component
Abstract
A method for coating a surface of a track component with a
coating containing aluminum by means of an arc spraying process. In
order to form a coating that exhibits a high resistance to sliding
and abrasive wear, aluminum and silicon are applied to the surface
in a ratio of 3:2.ltoreq.Al:Si.ltoreq.4:1 by an arc spraying
process.
Inventors: |
Kunitz, Walter; (Wildau,
DE) ; Heilscher, Joachim; (Wusterwitz, DE) ;
Schmedders, Stefan; (Butzbach, DE) |
Correspondence
Address: |
DENNISON, SCHULTZ, DOUGHERTY & MACDONALD
1727 KING STREET
SUITE 105
ALEXANDRIA
VA
22314
US
|
Assignee: |
BWG GmbH & Co. KG
Wetzlarer Strasse 101
35510 Butzbach
DE
|
Family ID: |
30001484 |
Appl. No.: |
10/514242 |
Filed: |
November 22, 2004 |
PCT Filed: |
June 26, 2003 |
PCT NO: |
PCT/EP03/06782 |
Current U.S.
Class: |
428/446 ;
427/446; 428/457; 428/650; 428/937 |
Current CPC
Class: |
Y10T 428/31678 20150401;
Y10T 428/12736 20150115; E01B 7/02 20130101; E01B 2202/06 20130101;
C23C 4/131 20160101; Y10T 428/12972 20150115; Y10T 428/12757
20150115; E01B 2202/042 20130101 |
Class at
Publication: |
428/446 ;
427/446; 428/457; 428/937; 428/650 |
International
Class: |
B05D 001/08; C23C
004/00; B32B 015/04; B32B 015/20 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 27, 2002 |
DE |
102 28 907.7 |
Feb 12, 2003 |
DE |
103 13 957.5 |
Claims
1. A method of coating a surface of a track component with a
coating containing an aluminum by means of an arc spraying process,
characterized in that aluminum and silicon are applied to the
surface in a ratio of 3:2.ltoreq.Al:Si.ltoreq.4:1 by an arc
spraying process.
2. The method according to claim 1, characterized in that the
aluminum and silicon are applied in a ratio of
Al:Si.apprxeq.3:1.
3. The method according to claim 1, characterized in that a
sheathed wire having a sheathing of aluminum and powdered silicon
incorporated by it is used as spray % Wire for the arc spraying
process.
4. The method according to claim 1, characterized in that the
melted aluminum and silicon are applied to the surface at a feed
pressure of 2 to 4 bar over atmospheric pressure.
5. The method according to claim 1, characterized in that the
coating is applied to the surface with a thickness d of 0.2
mm.ltoreq.mm.ltoreq.d.lt- oreq.2 mm, preferably 0.8
mm.ltoreq.d.ltoreq.1.5 mm.
6. The method according to claim 3, characterized in that the
sheathed wires as spray wires are fed to the arc at a wire feed
velocity of 1 m/sec..ltoreq.V.ltoreq.15 m/sec., preferably 6
m/sec..ltoreq.V.ltoreq.8 m/sec.
7. The method according to claim 3, characterized in that a voltage
difference U, where 30 V.ltoreq.U.ltoreq.50 V, in particular
U.apprxeq.40 V, is set between the spray wires.
8. The method according to claim 3, characterized in that a current
I, where 200 A.ltoreq.I.ltoreq.600 A, in particular 250
A.ltoreq.I.ltoreq.500 A, flows between the spray wries in order to
melt them.
9. A track component (10) such as a switch component having an
aluminum-containing coating (28) applied by an arc spraying
process, characterized in that the coating (28) comprises or
contains aluminum and silicon in a ratio
3:2.ltoreq.Al:Si.ltoreq.4:1.
10. The track component according to claim 9. characterized in that
the track component (10) is a slide chair or switch lock.
11. The track component according to claim 9, characterized in that
the coating of aluminum and silicon is applied to the track
component (10) in the ratio 3:1.
12. The track component according to claim 9, characterized in that
the coating (28) has a thickness d, where 0.2 mm.ltoreq.d.ltoreq.2
mm, preferably 0.8 mm.ltoreq.d.ltoreq.1.5 mm.
13. The track component according to claim 9, characterized in that
the coating (28) is applied to a high-strength steel St 52.
14. The track component according to claim 9, characterized in that
the coating (28) is a single coating.
Description
[0001] The invention relates to a method of coating a surface of a
track component having an aluminum-containing coating by means of
an arc spraying process. The invention also relates to a track
component, such as a switch component, with an aluminum-containing
coating applied by an arc spraying process.
[0002] A slide chair is known from DE 38 05 963 A2 in which a
lubricant is applied by a plasma or flame spraying process, the
lubricant containing molybdenum or ternary or quarternary alloys
based on Co or Ni, optionally with additives such as Mo, Cr and/or
Si.
[0003] A sectional rail for a monorail having a bearing surface
which is horizontal in cross section and to which a metal is
applied by a flame spraying or arc spraying process can be found in
DE 38 41 044 C2. The metal surfacing in that case comprises an
adherence layer and a wear layer which contains 10% to 25%
chromium. The adherence coating itself is preferably composed of
60% to 90% nickel and 10% to 40% aluminum. The thickness of the
metal coating can be between 0.3 mm and 5 mm.
[0004] The disadvantage of a corresponding metal coating applied by
an arc spraying process is that it is double-layered, the sliding
and abrasive wear not being substantially increased in comparison
to those coatings consisting of molybdenum which are applied by
flame spraying, yet are single-layered.
[0005] The present invention is based on the problem of further
developing a method of coating a surface of a track component as
well as the track component itself in such a way that a coating can
be formed in a technically simple manner, the coating having a high
resistance to sliding and abrasive wear and, in particular, a high
corrosion resistance to atmospheric electrolytes such as e.g. salt
water or de-icing agents. A good adherence should also be
provided.
[0006] According to the invention, the problem is substantially
solved, by a method of the aforementioned type, in that aluminum
and silicon are applied to the surface in a ratio of
3:2.ltoreq.Al:Si.ltoreq.4:1 by arc spraying. In particular,
aluminum is applied in a ratio of 3:1 to silicon.
[0007] The thickness of the coating comprising or containing
aluminum and silicon should be between 0.2 mm and 2 mm, in
particular in the range between 0.8 mm and 1.5 mm. A good adherence
was shown when the coating was applied to a high-strength steel
such as St 52.
[0008] According to the invention, aluminum and silicon are
applied, in particular, to switch parts such as slide chairs or
switch locks, such as can be found e.g. in EP 0739804, whereby the
desired higher resistances to sliding and abrasive wear as well as
high corrosion resistance can be obtained even with extremely small
thicknesses. Substantial advantges are thereby provided, in
particular in comparison to the previously known coating substances
such as molybdenum and bronze. However, advantages are also shown
in comparison to the multicoating structure according to DE 38 41
044 C2, insofar as only one coating is required which also meets
all requirements when the coating thicknesses are only between 0.8
mm and 1.5 mm.
[0009] Cost-related advantages also result in comparison to e.g.
nickel and aluminum or molybdenum substances, which are used
according to the state of the art.
[0010] A track component such as a switch component or switch
locking parts having a coating containing aluminum applied by an
arc spraying process is distinguished in that this coating
comprises or contains aluminum and silicon in a ratio of
3:2.ltoreq.Al:Si.ltoreq.4:1, in particular, wherein aluminum is in
a ratio of 3:1 to silicon.
[0011] In this case, a sheathed wire having a sheathing of aluminum
and powdered silicon incorporated therein is preferably used as
spray wire for the arc spraying process. Furthermore, the melted
aluminum and silicon should be applied to the surface at a feed
pressure of 2 to 4 bar over atmospheric pressure to obtain the
desired adhesion. The coating should thereby be applied to the
surface with a thickness d of 0.2 mm.ltoreq.d.ltoreq.2 mm,
preferably 0.8 mm.ltoreq.d.ltoreq.1.5 mm.
[0012] The sheathed wire serving as the spray wire is conveyed to
the arc with a wire feed rate V, where 1 m/sec..ltoreq.V.ltoreq.15
m/sec., preferably 6 m/sec..ltoreq.V.ltoreq.8 m/sec., whereby a
voltage difference U, where 30 V.ltoreq.U.ltoreq.50 V, in
particular U.apprxeq.40 V, should be set between the spray wires.
To melt the aluminum and silicon, a current I, where
200/A.ltoreq.I.ltoreq.600 A, in particular 250
A.ltoreq.I.ltoreq.500 A, should flow between the spray wires.
[0013] Further details, advantages and features of the invention
can not only be found in the claims, the features found in said
claims, alone or in combination, but also in the following
description of a preferred embodiment found in the drawing.
[0014] A basic representation of a device for applying a spray
coating to a track part in the form of a slide chair 10 is shown in
the only figure. A device 12 in which spray wires 18, 20 can be
moved together relative to the slide chair 10 via wire feed devices
14, 16 is directed towards the slide chair 10. Since a voltage V of
between 30 V and 50 V, in particular about 40 V, prevails between
the spray wires 18, 20, an arc 22 can form between the spray wires
18 and 20 to melt the arc material. This takes place, as a result
of the prevailing voltage difference when an arc forms between the
spray wires 18, 20, which, due to their different potentials, have
the function of an anode and cathode in the area of the tips 22. A
current I between 200 A and 600 A therefore flows, with the result
that a temperature of about 4000.degree. C. is produced, which
leads to the desired melting of the spray wires. Gas is
simultaneously conveyed to the arc 22 between the spray wires 18,
20 via a channel 24 at a pressure of preferably 3 to 4 bar, so that
a spray jet 26 is formed which is deposited as a coating 28 on the
slide chair 10.
[0015] To ensure that the coating 28 is formed uniformly and to the
desired extent, the device 12, in direction of arrow 30, and/or the
slide chair 10, in direction of arrow 32, are moved relative to one
another at a desired velocity V.sub.G, where 600
mm/sec..ltoreq.V.sub.G.ltoreq.1300 mm/sec.
[0016] The spray wires 18, 20 are sheathed wires having a sheathing
consisting of aluminum with powdered silicon therein. The ratio of
aluminum and silicon is thereby set in such a way that the spray
jet 26 has a composition of aluminum and silicon in the ratio of
between 3:2 and 4:1, in particular 3:1.
[0017] As a result, the coating 28 obtains a high resistance to
sliding and abrasive wear as well as a high corrosion resistance to
atmospheric electrolytes such as salt water and de-icing agents.
Furthermore, a high adherence results on the surface of the slide
chair.
[0018] The sheathed wires or spray wires 18, 20 are fed to the arc
22 via the feed device 14, 16 at a velocity of, in particular, 30
mm/sec..ltoreq.V.ltoreq.100 mm/sec.
* * * * *